Considering how heavily I bank on the actor for inspiration for the character, it's only natural that his physicality is also modeled after Peter Lorre. I took one look at this picture and was thought "yup, grook it is!"

He is a human. His body looks as though it has seen better days. Large sacks of skin tissue hang under his arms and his open shirt reveals a big, mighty belly that obviously took years to attain. His scalp is bald, but you can hardly tell because this man is the owner of a beautiful comb over that involves a large part of his white beard. A strong smell of bird excrements clings around him.

So, I didn't design Shimi to look specifically like anyone, but it's thanks to @Loalaine that I found two people who look like her. 98% of the time she carries too many weapons and skulks around looking like Ciri from Witcher 3In her softer moments she looks more like the one with the flower crown, a russian model named Nadya Zhidaya.*edited cause I can't talk or forums today..